What is the term for an inflow of assets due to selling a product or service?

The correct term for an inflow of assets due to selling a product or service is revenue. This concept is fundamental in financial and accounting practices, where revenue represents the total amount earned from business activities, primarily sales, prior to any deductions for expenses.

In this context, revenue is crucial as it reflects a company’s operational effectiveness and its ability to generate sales. It is the top line on an income statement, signifying the earnings before costs and expenses are subtracted. Essentially, it is the starting point for understanding a company's financial health.

The other terms, while related, have distinct meanings: capital refers to financial resources or assets the company uses to fund its operations; income is a broader term that can include revenue but typically refers to the amount remaining after subtracting expenses; and profit specifically denotes the amount that remains after all costs and expenses have been accounted for. These distinctions highlight why revenue is the most accurate and appropriate term for describing the inflow of assets from selling products or services.